Android app constantly freezes / crashes with update 9.0.1 update.

In my case, downgrading to the 8.6 APK on my phone solved my issue.
Care to post a screenshot of "About my Sonos System"?

Smilja, I too have this issue. I have a full library referenced on two desktop macs (both have the player software obviously). Plus Ipad, iphone and macbook Sonos controllers. My ipod with version 9.0 on it was working just fine before this update. Now the app is locking up constantly. All the other controllers seem to be fine. I can only assume that this version is not compatible with my ipod for whatever reason. The only way to gain control of the system is to close down the app restart it and make a few changes before it doesnt respond anymore or use a different controller on other hardware. The screen will show the last data (music service, song being streamed) before the lockup. The system will still play a streaming service but forget about making changes to rooms, streams, volume anything. Any other controller app being used on any other hardware is working as intended since the update. I too did uninstall the app and reinstall from scratch on this device and it seemed to be OK for about 15 minutes and then right back to the same lockups. Still experimenting to see if the iOS update with Lock Screen is part of the problem or if it locks up after I turn off the screen. Also asking myself if it will function as long as my screen does not go to sleep. More questions than answers but I am trying to narrow this down to what on this ipod is causing this problem while the others seem to be ok.

[...] Still experimenting to see if the iOS update with Lock Screen is part of the problem or if it locks up after I turn off the screen. Also asking myself if it will function as long as my screen does not go to sleep. More questions than answers but I am trying to narrow this down to what on this ipod is causing this problem while the others seem to be ok.
Sonos is currently looking into an issue related to Airplay devices such as Apple TV, Time Capsule and AirPort Express/Extreme. If you have any of these devices in your household, an upcoming update might solve the problems you are experiencing with the iOS Controller.

I had a working android app then Sonos did some updates and so did android now it just freezes if it opens at all. I've reinstalled the app several times with no change. Sonos works fine from Windows laptop. Its the phone app/Sonos update combination that seems to be the problem so has anyone actually found a solution. Please don't tell me to change anything other than the app or Sonos as nothing else has been changed or stopped working so it is only these things that are the problem and I suspect it is the app since the android update.
Presumably this is fixed as both my laptop and phone did updates on Sonos today and the phone now appears to work - or did I just get lucky?

Hard to tell, Sonos has a long history of not posting any update notes with their releases.

Give it some time. I thought mine was "fixed" yesterday (the phone worked fine) but then came home today and tried it and it had gone back to doing the same freezing thing.

Mine is now fixed and all that changed was Sonos Update last night.

Getting all of this back on topic, I'm still suffering from this exact situation, despite implementing (one at a time) every suggestion on this forum.

YES, I've uninstalled and reinstalled the Sonos controller app on both my Galaxy S9 and my fiance's iPhone 8.

YES, I've sequentially reset the entire network/all speakers. Several times.

YES, I've switched Sonos from SonosNet to wireless.

YES, I've dedicated static IP's to every one of my Sonos speakers - that's 5 Play 1's, 3 Play 3's, 2 Play 5's, a Playbar, and a Sonos Sub.

YES, I've called tech support (MANY times - escalated to a tier 2 with further investigations ongoing).

YES, I've submitted *dozens* of diagnostic reports, from both phones, the laptop, and the desktop.

YES, best case scenario is that I've temporarily regained control, only to have it revert to immediately crashing/freezing - at best several hours later.

YES, I've read through these forums.

SO: At this point I'm almost ready to sell the entire lot.

DOES ANYBODY HAVE ANY SUGGESTIONS??

The details about my setup:
-I've got a Samsung Galaxy s9, my fiance has an iPhone 8s.
-We *ONLY* use local music from a computer that's hardwired to our network.
-The computer controllers (both laptop and desktop, wireless and wired, respectively) still work flawlessly.
-The router setup is the Samsung Connect Home - a mesh network with 4 sub-hubs.
-EVERYTHING ELSE ON THE SYSTEM WORKS FINE. Nest cameras, August, Smartthings, Hue, the aforementioned Samsung Galaxy s9 and iPhone 8... LITERALLY EVERYTHING ELSE.

Any help would be greatly appreciated, as (quite simply), I'm at my wits end!

Thanks so much in advance!